4PRK

Crystal structure of D-lactate dehydrogenase (D-LDH) from Lactobacillus jensenii

4PRK の概要

• エントリーDOI: 10.2210/pdb4prk/pdb
• 関連するPDBエントリー: 4PRL
• 分子名称: 4-phosphoerythronate dehydrogenase (2 entities in total)
• 機能のキーワード: oxidoreductase, rossmann fold, nad
• 由来する生物種: Lactobacillus jensenii
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 74200.93

構造登録者

Kim, S.,Kim, K.J. (登録日: 2014-03-06, 公開日: 2014-06-18, 最終更新日: 2024-03-20)

主引用文献

Kim, S.,Gu, S.A.,Kim, Y.H.,Kim, K.J.
Crystal structure and thermodynamic properties of d-lactate dehydrogenase from Lactobacillus jensenii.
Int.J.Biol.Macromol., 68C:151-157, 2014

PubMed Abstract: The thermostable d-lactate dehydrogenase from Lactobacillus jensenii (Ljd-LDH) is a key enzyme in the production of the d-form of lactic acid from pyruvate concomitant with the oxidation of NADH to NAD(+). The polymers of d-lactic acid are used as biodegradable bioplastics. The crystal structures of Ljd-LDH and in complex with NAD(+) were determined at 2.13 and 2.60Å resolutions, respectively. The Ljd-LDH monomer consists of the N-terminal substrate-binding domain and the C-terminal NAD-binding domain. The Ljd-LDH forms a homodimeric structure, and the C-terminal NAD-binding domain mostly enables the dimerization of the enzyme. The NAD cofactor is bound to the GxGxxG NAD-binding motif located between the two domains. Structural comparisons of Ljd-LDH with other d-LDHs reveal that Ljd-LDH has unique amino acid residues at the linker region, which indicates that the open-close dynamics of Ljd-LDH might be different from that of other d-LDHs. Moreover, thermostability experiments showed that the T50(10) value of Ljd-LDH (54.5°C) was much higher than the commercially available d-lactate dehydrogenase (42.7°C). In addition, Ljd-LDH has at least a 7°C higher denaturation temperature compared to commercially available d-LDHs.

PubMed: 24794195
DOI: 10.1016/j.ijbiomac.2014.04.048

実験手法

X-RAY DIFFRACTION (2.13 Å)